Consider the following TypeScript generic function:

function combine$($first: T$,$ second: U$)$: T $|$ U $\{$

return $\{...$first, $...$second $\}$;

$\}$

const output $=$ combine$(\{$ job: $$Engineer$\},\{$ salary: $50000\})$;

What is the type of output?

Answers:

$1.$ object

$2.\{\{$ job: string $\},\{$ salary: number $\}\}$

$3.\{$ job: string $\}|\{$ salary: number $\}$

$4.$ T $|$ U

$5.$ Error: Type $$T$$ is not assignable to type $$U$.$